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TFT display

The project supports Graphic color TFT displays based on various controllers:

  • 160x128: ILI9163, S6D0144, ST7735
  • 176x132: L2F50126, LPH9157, LS020, SSD1286A
  • 220x176: HX8340, ILI9225, LGDP4524, S6D0164
  • 320x240: HX8347A, HX8347D, ILI9320, ILI9341, MC2PA8201, S6D0129, S6D0139, SPFD5408, SSD1289, SSD2119
  • 400x240: ILI9327, S6D04D1, ST7793
  • 480x320: HX8357C, ILI9481, ILI9486, R61581, RM68140, ST7796S

8-bit display connection:

D0-D7 (data bus): PB0-PB7 RD (read pin): pull to 3.3V WR: (write pin): PB15 RS: (register select): PB14 CS: (chip select): PB12 RST: (reset): pull to 3.3V BCKL: (backlight): PC13

SPI display connection

CS: (chip select): PB12 RST: (reset): pull to 3.3V DC: (data/command): PB14 SDI: (slave data input): PB15 (hardware SPI2 MOSI) SCK: (slave clock): PB13 (hardware SPI2 SCK) LED: (backlight): PC13 SDO: (slave data ooutput): pull to 3.3V

Audiocontrollers and FM tuners

Most of the external chips are connected via I²C bus (hardware SPI1)

SDA: PB9 SCL: PB8

Si4703 tuner with 32768kHz quartz also needs reset pin connection:

RST: PA15

MUTE and STBY control

When entering standby mode, it's useful to disable powering some parts of the whole projects (like audio amplifier, audioprocessor, etc). So, only ampcontrol control module itself can be left powered with lower display brighness. STBY pin can be used to control a relay or another swtitch doing this.

Also, switching between inputs, powering on/off can produce audible clicks in acoustic system. MUTE pin can be used to mute an amplifier at these moments.

STBY: PB10 MUTE: PB11

Remote control

Standard TSOP IR receiver is used to get control commands from IR remote.

IR: PA8

BT201 bluetooth module

USART1 used for communications with the module. So, playback is fully controlled as well as an information about current song from USB or SDCARD is retreived

TX: PA9 RX: PA10

Bluetooth modules like BK8000L or CSR8645

These modules don't have known interface to communicate with MCUs. But they have GPIOs to connect buttons for such functions as PLAY/PAUSE and so on.

To control such kind of bluetooth modules, it's possible to use PCF8574 I²C bus expander to emulate buttons presses to execute corresponding functions. It's connected to the project via I²C line:

SDA: PB9 SCL: PB8

Then, the correct I²C address (depends on PCF8574 address input pins conditions) should be selected in ampcontrol settings.

PCF5874 is connected to the BT module in this way (see i2cexp.h):

NEXT_TRACK: P5 PREV_TRACK: P4 NEXT_INPUT: P3 PLAY_PAUSE: P2

To emulate button press, PCF8574 sends short (200ms) positive impulse on the pin.

KaRadio or MPD

The device can act as a "plugin" for KaRadio/KaRadio32 projects. The control and all communications are done via USART2 connection

TX: PA2 RX: PA3

Also, instead of KaRadio it's possible to control MPD (Music Player Daemon). The board with MPD (e.g. Raspberry Pi or alternative) need to be prepared and it should include mpd-uart.py script running. This script makes implements a communication between Ampcontrol's USART2 and the board's MPD daemon. Python3 packages pyserial and python-mpd2 need to be installed.

USB

When connectetd to the PC via hardware USB, the project acts as "USB keyboard" and sends multimedia keys to the PC when a button on front panel or remote control is pressed. Thus, playback in active multimedia player on PC supporting media keys can be controlled.